Sir Iain Duncan Smith is one of the longest-serving MPs in parliament, having been elected in April 1992 and ranking fifth overall and third among Conservative MPs for length of service. He cast 261 votes across 537 eligible divisions for a participation rate of 48.6%, ranking 345th overall among MPs, while contributing 412 debate contributions across 170 debates, ranking 155th overall. His debate contributions are notably stronger than his voting participation, with his primary focus in debate on Foreign Affairs and Defence, Justice and Law, and International Development. He did not hold a government post during the current parliament.

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